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Here we go:
QUESTIONS:
1. You need to insert huge amount of objects and randomly delete them one by one. Which Collection data structure is best pet?
2. What goes wrong if the HashMap key has same hashCode value?
3. If hashCode() method is overridden but equals() is not, for the class ‘A’, then what may go wrong if you use this class as a key in HashMap?
4. How will you remove duplicate element from a List?
5. How will you synchronize a Collection class dynamically?
ANSWERS:
1. Obviously, LinkedList.
2. It leads to ‘Collision’ wherein all the values are stored in same bucket. Hence, the searching time increases quad radically.
3. Left to Readers.
4. Add the List elements to Set. Duplicates will be removed.
5. Use the utility method java.util.Collections.synchronizedCollection(Collection c)
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Is this your blog Mani?
Nice thing to see you blogging on your own site…
–Spartan
@Spartan: ya, it’s my blog
nice to hear from you after long time.
I am amazed with it. It is a good thing for my research. Thanks
Hi Maini,,, excellent questions……i have been searching for these type of real time questions for some time now……definitely useful for me
Thanks,
Rajesh
Thnx for ur selective realtime questions,that most of the IT people faced in the intreviews…
Regards,
Malay
Hi mani,thank u these questions are very useful to everyone ..
can u send these type of real time questions to my id…
once again thank u
Hi Mani, Can you please email me interview question on Design Patterns, Webservices and EJB’s. Thanks in advance
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These questions are really nice, I did face a client interview recently and these kind of questions were asked, I wish i would have seen this before
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Can someone answer this for me?
If hashCode() method is overridden but equals() is not, for the class ‘A’, then what may go wrong if you use this class as a key in HashMap?
If ‘A’ does not override equals() then when you use it as key in map . you will not be able to find the value for which you have used this class’s object as key.
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